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                        序言
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        <li class="chapter " data-level="1" data-path="认识爬虫/introduceSpider.html">
            
                
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                            <b>1.</b>
                        
                        认识爬虫
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        <li class="chapter " data-level="1.1" data-path="认识爬虫/http.html">
            
                
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                            <b>1.1.</b>
                        
                        HTTP
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                            <b>1.2.</b>
                        
                        requests
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        <li class="chapter " data-level="1.3" data-path="认识爬虫/初步爬虫.html">
            
                
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                            <b>1.3.</b>
                        
                        初步爬虫小项目
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        <li class="chapter " data-level="2" data-path="正则表达式/正则表达式.html">
            
                
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                            <b>2.</b>
                        
                        正则表达式
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                            <b>2.1.</b>
                        
                        正则表达式练习
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                            <b>2.2.</b>
                        
                        正则表达式之后的第一个项目
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                            <b>2.3.</b>
                        
                        正则表达式常用表
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        <li class="chapter " data-level="2.4" data-path="正则表达式/正则表达式重点1.html">
            
                
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                            <b>2.4.</b>
                        
                        正则表达式重点
                    </a>
            
            
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                    <a href="../正则表达式/正则表达式常问问题.html">
                
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                            <b>2.5.</b>
                        
                        正则表达式常问问题
                    </a>
            
            
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        <li class="chapter " data-level="2.6" data-path="正则表达式/正则爬虫练习.html">
            
                
                    <a href="../正则表达式/正则爬虫练习.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>2.6.</b>
                        
                        正则爬虫项目练习
                    </a>
            
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="3" data-path="XPATH/xpath-in.html">
            
                
                    <a href="../XPATH/xpath-in.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>3.</b>
                        
                        XPATH
                    </a>
            
            
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        <li class="chapter active" data-level="3.1" data-path="XPATH/Xpath.html">
            
                
                    <a href="../XPATH/Xpath.html">
                
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                            <b>3.1.</b>
                        
                        XPATH认识
                    </a>
            
            
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                            <b>3.2.</b>
                        
                        XPATH的代码例子
                    </a>
            
            
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                            <b>3.3.</b>
                        
                        XPATH的爬虫练习
                    </a>
            
            
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        <li class="chapter " data-level="4" data-path="BeautifulSoup/BeautifulSoup.html">
            
                
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                            <b>4.</b>
                        
                        BeautifulSoup
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="4.1" data-path="BeautifulSoup/常用的css选择器.html">
            
                
                    <a href="../BeautifulSoup/常用的css选择器.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>4.1.</b>
                        
                        常用的css选择器
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="4.2" data-path="BeautifulSoup/BeautifulSoup4的各种例子.html">
            
                
                    <a href="../BeautifulSoup/BeautifulSoup4的各种例子.html">
                
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                            <b>4.2.</b>
                        
                        BeautifulSoup4的各种例子
                    </a>
            
            
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        <li class="chapter " data-level="5" data-path="代理/proxy.html">
            
                
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                            <b>5.</b>
                        
                        ip代理池项目
                    </a>
            
            
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        <li class="chapter " data-level="6" data-path="Selenium/Selenium.html">
            
                
                    <a href="../Selenium/Selenium.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>6.</b>
                        
                        Selenium
                    </a>
            
            
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        <li class="chapter " data-level="7" data-path="进程线程协程/introduce.html">
            
                
                    <a href="../进程线程协程/introduce.html">
                
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                            <b>7.</b>
                        
                        进程线程协程
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="7.1" data-path="进程线程协程/gevent.html">
            
                
                    <a href="../进程线程协程/gevent.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>7.1.</b>
                        
                        gevent
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="7.2" data-path="进程线程协程/green_let.html">
            
                
                    <a href="../进程线程协程/green_let.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>7.2.</b>
                        
                        green_let
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="7.3" data-path="进程线程协程/yield.html">
            
                
                    <a href="../进程线程协程/yield.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>7.3.</b>
                        
                        yield
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="7.4" data-path="进程线程协程/multiprecessing.html">
            
                
                    <a href="../进程线程协程/multiprecessing.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>7.4.</b>
                        
                        multiprecessing
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="7.5" data-path="进程线程协程/threading.html">
            
                
                    <a href="../进程线程协程/threading.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>7.5.</b>
                        
                        threading
                    </a>
            
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="8" data-path="scrapy框架/scrapy.html">
            
                
                    <a href="../scrapy框架/scrapy.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.</b>
                        
                        Scrapy
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="8.1" data-path="scrapy框架/scrapy_setting.html">
            
                
                    <a href="../scrapy框架/scrapy_setting.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.1.</b>
                        
                        scrapy_setting
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.2" data-path="scrapy框架/模块作用.html">
            
                
                    <a href="../scrapy框架/模块作用.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.2.</b>
                        
                        模块作用
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.3" data-path="scrapy框架/19个中间件.html">
            
                
                    <a href="../scrapy框架/19个中间件.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.3.</b>
                        
                        19个中间件
                    </a>
            
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="9" data-path="scrapy-redis分布式/scrapy-redis.html">
            
                
                    <a href="../scrapy-redis分布式/scrapy-redis.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.</b>
                        
                        scrapy-redis分布式
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="9.1" data-path="scrapy-redis分布式/scrapy-redis的改造方法.html">
            
                
                    <a href="../scrapy-redis分布式/scrapy-redis的改造方法.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.1.</b>
                        
                        scrapy-redis的改造方法
                    </a>
            
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="10" data-path="spider_projects/introduce.html">
            
                
                    <a href="../spider_projects/introduce.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.</b>
                        
                        spider_projects
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="10.1" data-path="spider_projects/使用代理在普通爬虫脚本下.html">
            
                
                    <a href="../spider_projects/使用代理在普通爬虫脚本下.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.1.</b>
                        
                        使用代理在普通爬虫脚本下
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.2" data-path="spider_projects/xpath爬取前程无忧的数据.html">
            
                
                    <a href="../spider_projects/xpath爬取前程无忧的数据.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.2.</b>
                        
                        xpath爬取前程无忧的数据
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.3" data-path="spider_projects/存储数据库的脚本.html">
            
                
                    <a href="../spider_projects/存储数据库的脚本.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.3.</b>
                        
                        存储数据库的脚本
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.4" data-path="spider_projects/weibo.html">
            
                
                    <a href="../spider_projects/weibo.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.4.</b>
                        
                        爬取央视新闻微博
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.5" data-path="spider_projects/weibo2.html">
            
                
                    <a href="../spider_projects/weibo2.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.5.</b>
                        
                        爬取明星的微博
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.6" data-path="spider_projects/liepin.html">
            
                
                    <a href="../spider_projects/liepin.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.6.</b>
                        
                        爬取猎聘的职位信息Crawl
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.7" data-path="spider_projects/zhilianRe.html">
            
                
                    <a href="../spider_projects/zhilianRe.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.7.</b>
                        
                        纯正则爬取智联的职位信息
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.8" data-path="spider_projects/setting.html">
            
                
                    <a href="../spider_projects/setting.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.8.</b>
                        
                        scrapy中的setting
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.9" data-path="spider_projects/items.html">
            
                
                    <a href="../spider_projects/items.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.9.</b>
                        
                        scrapy中的items
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.10" data-path="spider_projects/pipeline.html">
            
                
                    <a href="../spider_projects/pipeline.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.10.</b>
                        
                        scrapy中的pipeline
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.11" data-path="spider_projects/middlewares.html">
            
                
                    <a href="../spider_projects/middlewares.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.11.</b>
                        
                        scrapy中的middlewares
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.12" data-path="spider_projects/框架中的代码运行脚本.html">
            
                
                    <a href="../spider_projects/框架中的代码运行脚本.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.12.</b>
                        
                        框架中的代码运行脚本
                    </a>
            
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="11" data-path="爬虫的面试题/面试题1-10.html">
            
                
                    <a href="../爬虫的面试题/面试题1-10.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>11.</b>
                        
                        爬虫面试题
                    </a>
            
            
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                        <h1 id="xpath">XPATH</h1>
<p>&#x4E0A;&#x4E00;&#x90E8;&#x5206;&#x8BF4;&#x5230;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#xFF0C;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x901A;&#x5E38;&#x88AB;&#x7528;&#x6765;&#x68C0;&#x7D22;&#xFF0C;&#x66FF;&#x6362;&#x90A3;&#x4E9B;&#x7B26;&#x5408;&#x67D0;&#x4E2A;&#x6A21;&#x5F0F;(&#x89C4;&#x5219;)&#x7684;&#x6587;&#x672C;&#x3002;</p>
<p>&#x90A3;&#x4E48;&#x7F3A;&#x70B9;&#x662F;&#xFF1A;</p>
<ol>
<li>&#x5F53;&#x5339;&#x914D;&#x7A0D;&#x5FAE;&#x590D;&#x6742;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5F88;&#x96BE;&#x88AB;&#x7406;&#x89E3;</li>
<li>&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x6027;&#x80FD;&#x5F88;&#x96BE;&#x628A;&#x63E1;&#x3002;
&#x6240;&#x4EE5;&#x8FD9;&#x4E2A;&#x65F6;&#x5019;&#x6211;&#x4EEC;&#x5C31;&#x53EF;&#x4EE5;&#x8FD0;&#x7528;j&#x89E3;&#x6790;&#x6570;&#x636E;&#x5305;&#x3002;</li>
</ol>
<hr>
<p>&#x6D4B;&#x8BD5;&#x7684;&#x8BDD;&#x53EF;&#x4EE5;&#x9009;&#x62E9;&#x4E0B;&#x9762;&#x8FD9;&#x4E2A;&#x5305;&#xFF1A;</p>
<pre><code class="lang-python">pip install lxml
</code></pre>
<hr>
<h2 id="xpath-&#x672F;&#x8BED;&#x4ECB;&#x7ECD;">XPATH &#x672F;&#x8BED;&#x4ECB;&#x7ECD;</h2>
<p>&#x8282;&#x70B9;(Node)</p>
<p>&#x8BF7;&#x770B;&#x4E0B;&#x9762;&#x8FD9;&#x4E2A; XML &#x6587;&#x6863;&#xFF1A;</p>
<pre><code class="lang-html"><span class="hljs-tag">&lt;<span class="hljs-title">bookstore</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-title">book</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">title</span> <span class="hljs-attribute">lang</span>=<span class="hljs-value">&quot;en&quot;</span>&gt;</span>Harry Potter<span class="hljs-tag">&lt;/<span class="hljs-title">title</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">author</span>&gt;</span>J K. Rowling<span class="hljs-tag">&lt;/<span class="hljs-title">author</span>&gt;</span> 
  <span class="hljs-tag">&lt;<span class="hljs-title">year</span>&gt;</span>2005<span class="hljs-tag">&lt;/<span class="hljs-title">year</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">price</span>&gt;</span>29.99<span class="hljs-tag">&lt;/<span class="hljs-title">price</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-title">book</span>&gt;</span>

<span class="hljs-tag">&lt;/<span class="hljs-title">bookstore</span>&gt;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x7684;XML&#x6587;&#x6863;&#x4E2D;&#x7684;&#x8282;&#x70B9;&#x4F8B;&#x5B50;&#xFF1A;  </p>
<pre><code class="lang-html"><span class="hljs-tag">&lt;<span class="hljs-title">bookstore</span>&gt;</span> &#xFF08;&#x6587;&#x6863;&#x8282;&#x70B9;&#xFF09;
<span class="hljs-tag">&lt;<span class="hljs-title">author</span>&gt;</span>J K. Rowling<span class="hljs-tag">&lt;/<span class="hljs-title">author</span>&gt;</span> &#xFF08;&#x5143;&#x7D20;&#x8282;&#x70B9;&#xFF09;
lang=&quot;en&quot; &#xFF08;&#x5C5E;&#x6027;&#x8282;&#x70B9;&#xFF09;
</code></pre>
<p>&#x57FA;&#x672C;&#x503C;&#x7684;&#x4F8B;&#x5B50;&#xFF1A;</p>
<pre><code class="lang-html">J K. Rowling
&quot;en&quot;
</code></pre>
<hr>
<h5 id="&#x8282;&#x70B9;&#x4E4B;&#x95F4;&#x7684;&#x5173;&#x7CFB;">&#x8282;&#x70B9;&#x4E4B;&#x95F4;&#x7684;&#x5173;&#x7CFB;</h5>
<hr>
<p><strong>&#x7236;&#xFF08;Parent&#xFF09;</strong></p>
<p>&#x6BCF;&#x4E2A;&#x5143;&#x7D20;&#x4EE5;&#x53CA;&#x5C5E;&#x6027;&#x90FD;&#x6709;&#x4E00;&#x4E2A;&#x7236;  </p>
<p>&#x5728;&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x4E2D;&#xFF0C;book &#x5143;&#x7D20;&#x662F; title&#x3001;author&#x3001;year &#x4EE5;&#x53CA; price &#x5143;&#x7D20;&#x7684;&#x7236;&#xFF1A;</p>
<pre><code class="lang-html"><span class="hljs-tag">&lt;<span class="hljs-title">book</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">title</span>&gt;</span>Harry Potter<span class="hljs-tag">&lt;/<span class="hljs-title">title</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">author</span>&gt;</span>J K. Rowling<span class="hljs-tag">&lt;/<span class="hljs-title">author</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">year</span>&gt;</span>2005<span class="hljs-tag">&lt;/<span class="hljs-title">year</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">price</span>&gt;</span>29.99<span class="hljs-tag">&lt;/<span class="hljs-title">price</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-title">book</span>&gt;</span>
</code></pre>
<hr>
<p><strong>&#x5B50;&#xFF08;Children&#xFF09;</strong></p>
<p>&#x5143;&#x7D20;&#x8282;&#x70B9;&#x53EF;&#x6709;&#x96F6;&#x4E2A;&#x3001;&#x4E00;&#x4E2A;&#x6216;&#x591A;&#x4E2A;&#x5B50;&#x3002;  </p>
<p>&#x5728;&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x4E2D;&#xFF0C;title&#x3001;author&#x3001;year &#x4EE5;&#x53CA; price &#x5143;&#x7D20;&#x90FD;&#x662F; book &#x5143;&#x7D20;&#x7684;&#x5B50;&#xFF1A; </p>
<pre><code class="lang-html"><span class="hljs-tag">&lt;<span class="hljs-title">book</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">title</span>&gt;</span>Harry Potter<span class="hljs-tag">&lt;/<span class="hljs-title">title</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">author</span>&gt;</span>J K. Rowling<span class="hljs-tag">&lt;/<span class="hljs-title">author</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">year</span>&gt;</span>2005<span class="hljs-tag">&lt;/<span class="hljs-title">year</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">price</span>&gt;</span>29.99<span class="hljs-tag">&lt;/<span class="hljs-title">price</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-title">book</span>&gt;</span>
</code></pre>
<hr>
<p><strong>&#x5148;&#x8F88;(Ancestor)</strong>   </p>
<p>&#x67D0;&#x8282;&#x70B9;&#x7684;&#x7236;&#x3001;&#x7236;&#x7684;&#x7236;&#xFF0C;&#x7B49;&#x7B49;&#x3002;  </p>
<p>&#x5728;&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x4E2D;&#xFF0C;title &#x5143;&#x7D20;&#x7684;&#x5148;&#x8F88;&#x662F; book &#x5143;&#x7D20;&#x548C; bookstore &#x5143;&#x7D20;&#xFF1A; </p>
<pre><code class="lang-html"><span class="hljs-tag">&lt;<span class="hljs-title">bookstore</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-title">book</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">title</span>&gt;</span>Harry Potter<span class="hljs-tag">&lt;/<span class="hljs-title">title</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">author</span>&gt;</span>J K. Rowling<span class="hljs-tag">&lt;/<span class="hljs-title">author</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">year</span>&gt;</span>2005<span class="hljs-tag">&lt;/<span class="hljs-title">year</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">price</span>&gt;</span>29.99<span class="hljs-tag">&lt;/<span class="hljs-title">price</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-title">book</span>&gt;</span>

<span class="hljs-tag">&lt;/<span class="hljs-title">bookstore</span>&gt;</span>
</code></pre>
<hr>
<p><strong>&#x540E;&#x4EE3;&#xFF08;Descendant&#xFF09;</strong>   </p>
<p>&#x67D0;&#x4E2A;&#x8282;&#x70B9;&#x7684;&#x5B50;&#xFF0C;&#x5B50;&#x7684;&#x5B50;&#xFF0C;&#x7B49;&#x7B49;&#x3002;  </p>
<p>&#x5728;&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x4E2D;&#xFF0C;bookstore &#x7684;&#x540E;&#x4EE3;&#x662F; book&#x3001;title&#x3001;author&#x3001;year &#x4EE5;&#x53CA; price &#x5143;&#x7D20;&#xFF1A;</p>
<pre><code class="lang-html"><span class="hljs-tag">&lt;<span class="hljs-title">bookstore</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-title">book</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">title</span>&gt;</span>Harry Potter<span class="hljs-tag">&lt;/<span class="hljs-title">title</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">author</span>&gt;</span>J K. Rowling<span class="hljs-tag">&lt;/<span class="hljs-title">author</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">year</span>&gt;</span>2005<span class="hljs-tag">&lt;/<span class="hljs-title">year</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">price</span>&gt;</span>29.99<span class="hljs-tag">&lt;/<span class="hljs-title">price</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-title">book</span>&gt;</span>

<span class="hljs-tag">&lt;/<span class="hljs-title">bookstore</span>&gt;</span>
</code></pre>
<hr>
<h3 id="&#x9009;&#x53D6;&#x8282;&#x70B9;">&#x9009;&#x53D6;&#x8282;&#x70B9;</h3>
<hr>
<pre><code class="lang-html"><span class="hljs-pi">&lt;?xml version=&quot;1.0&quot; encoding=&quot;ISO-8859-1&quot;?&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-title">bookstore</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-title">book</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">title</span> <span class="hljs-attribute">lang</span>=<span class="hljs-value">&quot;eng&quot;</span>&gt;</span>Harry Potter<span class="hljs-tag">&lt;/<span class="hljs-title">title</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">price</span>&gt;</span>29.99<span class="hljs-tag">&lt;/<span class="hljs-title">price</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-title">book</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-title">book</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">title</span> <span class="hljs-attribute">lang</span>=<span class="hljs-value">&quot;eng&quot;</span>&gt;</span>Learning XML<span class="hljs-tag">&lt;/<span class="hljs-title">title</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-title">price</span>&gt;</span>39.95<span class="hljs-tag">&lt;/<span class="hljs-title">price</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-title">book</span>&gt;</span>

<span class="hljs-tag">&lt;/<span class="hljs-title">bookstore</span>&gt;</span>
</code></pre>
<table>
<thead>
<tr>
<th style="text-align:left">&#x8868;&#x8FBE;&#x5F0F;</th>
<th style="text-align:center">&#x63CF;&#x8FF0;</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">nodename</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x6B64;&#x8282;&#x70B9;&#x7684;&#x6240;&#x6709;&#x5B50;&#x8282;&#x70B9;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">/</td>
<td style="text-align:center">&#x4ECE;&#x6839;&#x8282;&#x70B9;&#x9009;&#x53D6;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">//</td>
<td style="text-align:center">&#x4ECE;&#x5339;&#x914D;&#x9009;&#x62E9;&#x7684;&#x5F53;&#x524D;&#x8282;&#x70B9;&#x9009;&#x62E9;&#x6587;&#x6863;&#x4E2D;&#x7684;&#x8282;&#x70B9;&#xFF0C;&#x800C;&#x4E0D;&#x8003;&#x8651;&#x5B83;&#x4EEC;&#x7684;&#x4F4D;&#x7F6E;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">.</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x5F53;&#x524D;&#x8282;&#x70B9;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">..</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x5F53;&#x524D;&#x8282;&#x70B9;&#x7684;&#x7236;&#x8282;&#x70B9;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">@</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x5C5E;&#x6027;&#x3002;</td>
</tr>
</tbody>
</table>
<hr>
<p><strong>&#x5B9E;&#x4F8B;</strong></p>
<p>&#x5728;&#x4E0B;&#x9762;&#x7684;&#x8868;&#x683C;&#x4E2D;&#xFF0C;&#x6211;&#x4EEC;&#x5DF2;&#x5217;&#x51FA;&#x4E86;&#x4E00;&#x4E9B;&#x8DEF;&#x5F84;&#x8868;&#x8FBE;&#x5F0F;&#x4EE5;&#x53CA;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x7ED3;&#x679C;&#xFF1A;</p>
<table>
<thead>
<tr>
<th style="text-align:left">&#x8DEF;&#x5F84;&#x8868;&#x8FBE;&#x5F0F;</th>
<th style="text-align:center">&#x7ED3;&#x679C;</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">bookstore</td>
<td style="text-align:center">&#x9009;&#x53D6; bookstore &#x5143;&#x7D20;&#x7684;&#x6240;&#x6709;&#x5B50;&#x8282;&#x70B9;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">/bookstore</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x6839;&#x5143;&#x7D20; bookstore&#x3002;<br>&#x6CE8;&#x91CA;&#xFF1A;&#x5047;&#x5982;&#x8DEF;&#x5F84;&#x8D77;&#x59CB;&#x4E8E;&#x6B63;&#x659C;&#x6760;( / )&#xFF0C;&#x5219;&#x6B64;&#x8DEF;&#x5F84;&#x59CB;&#x7EC8;&#x4EE3;&#x8868;&#x5230;&#x67D0;&#x5143;&#x7D20;&#x7684;&#x7EDD;&#x5BF9;&#x8DEF;&#x5F84;&#xFF01;</td>
</tr>
<tr>
<td style="text-align:left">bookstore/book</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x5C5E;&#x4E8E; bookstore &#x7684;&#x5B50;&#x5143;&#x7D20;&#x7684;&#x6240;&#x6709; book &#x5143;&#x7D20;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">//book</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x6240;&#x6709; book &#x5B50;&#x5143;&#x7D20;&#xFF0C;&#x800C;&#x4E0D;&#x7BA1;&#x5B83;&#x4EEC;&#x5728;&#x6587;&#x6863;&#x4E2D;&#x7684;&#x4F4D;&#x7F6E;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">bookstore//book</td>
<td style="text-align:center">&#x9009;&#x62E9;&#x5C5E;&#x4E8E; bookstore &#x5143;&#x7D20;&#x7684;&#x540E;&#x4EE3;&#x7684;&#x6240;&#x6709; book &#x5143;&#x7D20;&#xFF0C;&#x800C;&#x4E0D;&#x7BA1;&#x5B83;&#x4EEC;&#x4F4D;&#x4E8E; bookstore &#x4E4B;&#x4E0B;&#x7684;&#x4EC0;&#x4E48;&#x4F4D;&#x7F6E;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">//@lang</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x540D;&#x4E3A; lang &#x7684;&#x6240;&#x6709;&#x5C5E;&#x6027;&#x3002;</td>
</tr>
</tbody>
</table>
<p><strong>&#x8C13;&#x8BED;&#xFF08;Predicates&#xFF09;</strong><br>
&#x8C13;&#x8BED;&#x7528;&#x6765;&#x67E5;&#x627E;&#x67D0;&#x4E2A;&#x7279;&#x5B9A;&#x7684;&#x8282;&#x70B9;&#x6216;&#x8005;&#x5305;&#x542B;&#x67D0;&#x4E2A;&#x6307;&#x5B9A;&#x7684;&#x503C;&#x7684;&#x8282;&#x70B9;&#x3002;<br>
&#x8C13;&#x8BED;&#x88AB;&#x5D4C;&#x5728;&#x65B9;&#x62EC;&#x53F7;&#x4E2D;&#x3002;<br>
&#x5B9E;&#x4F8B;: <br></p>
<p>&#x5728;&#x4E0B;&#x9762;&#x7684;&#x8868;&#x683C;&#x4E2D;&#xFF0C;&#x6211;&#x4EEC;&#x5217;&#x51FA;&#x4E86;&#x5E26;&#x6709;&#x8C13;&#x8BED;&#x7684;&#x4E00;&#x4E9B;&#x8DEF;&#x5F84;&#x8868;&#x8FBE;&#x5F0F;&#xFF0C;&#x4EE5;&#x53CA;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x7ED3;&#x679C;&#xFF1A;</p>
<table>
<thead>
<tr>
<th style="text-align:left">&#x8DEF;&#x5F84;&#x8868;&#x8FBE;&#x5F0F;</th>
<th style="text-align:center">&#x7ED3;&#x679C;</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">/bookstore/book[1]</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x5C5E;&#x4E8E; bookstore &#x5B50;&#x5143;&#x7D20;&#x7684;&#x7B2C;&#x4E00;&#x4E2A; book &#x5143;&#x7D20;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">/bookstore/book[last()]</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x5C5E;&#x4E8E; bookstore &#x5B50;&#x5143;&#x7D20;&#x7684;&#x6700;&#x540E;&#x4E00;&#x4E2A; book &#x5143;&#x7D20;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">/bookstore/book[last()-1]</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x5C5E;&#x4E8E; bookstore &#x5B50;&#x5143;&#x7D20;&#x7684;&#x5012;&#x6570;&#x7B2C;&#x4E8C;&#x4E2A; book &#x5143;&#x7D20;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">/bookstore/book[position()&lt;3]</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x6700;&#x524D;&#x9762;&#x7684;&#x4E24;&#x4E2A;&#x5C5E;&#x4E8E; bookstore &#x5143;&#x7D20;&#x7684;&#x5B50;&#x5143;&#x7D20;&#x7684; book &#x5143;&#x7D20;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">//title[@lang]</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x6240;&#x6709;&#x62E5;&#x6709;&#x540D;&#x4E3A; lang &#x7684;&#x5C5E;&#x6027;&#x7684; title &#x5143;&#x7D20;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">//title[@lang=&apos;eng&apos;]</td>
<td style="text-align:center">&#x9009;&#x53D6;&#x6240;&#x6709; title &#x5143;&#x7D20;&#xFF0C;&#x4E14;&#x8FD9;&#x4E9B;&#x5143;&#x7D20;&#x62E5;&#x6709;&#x503C;&#x4E3A; eng &#x7684; lang &#x5C5E;&#x6027;&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">/bookstore/book[price&gt;35.00]</td>
<td style="text-align:center">&#x9009;&#x53D6; bookstore &#x5143;&#x7D20;&#x7684;&#x6240;&#x6709; book &#x5143;&#x7D20;&#xFF0C;&#x4E14;&#x5176;&#x4E2D;&#x7684; price &#x5143;&#x7D20;&#x7684;&#x503C;&#x987B;&#x5927;&#x4E8E; 35.00&#x3002;</td>
</tr>
<tr>
<td style="text-align:left">/bookstore/book[price&gt;35.00]/title</td>
<td style="text-align:center">&#x9009;&#x53D6; bookstore &#x5143;&#x7D20;&#x4E2D;&#x7684; book &#x5143;&#x7D20;&#x7684;&#x6240;&#x6709; title &#x5143;&#x7D20;&#xFF0C;&#x4E14;&#x5176;&#x4E2D;&#x7684; price &#x5143;&#x7D20;&#x7684;&#x503C;&#x987B;&#x5927;&#x4E8E; 35.00&#x3002;</td>
</tr>
</tbody>
</table>

                    
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